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Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments
$ in Millions
Mar. 31, 2020
USD ($)
Future aircraft purchase commitments:  
Nine months ending December 31, 2020 $ 2,560
2021 4,560
2022 3,060
2023 1,860
2024 1,000
Thereafter 1,700
Total $ 14,740